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A 1 hp motor pumps out water from a well of depth 20m and fills a water tank of volume 2238 litres at height from the ground the running time of the motor to fill the empty tank is (g =10m/s2)

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$\begin{align*} & p=\dfrac {mgh} {t} \Rightarrow 746=\dfrac {2238\times 10\times 30} {t}\\ & \Rightarrow t=900S=15\min \end{align*}$
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